Page 36 - dust collection systems

Note

Excessive cleaning of pulse jet bags can simultaneously cause

higher-than-normal emissions, higher than-normal static

pressure drop, and accelerated bag wear. If there is

insufficient dust cake on the bag when it is cleaned, particles

or small agglomerates of particles can be dispersed. These

particles do not settle by gravity and simply return to the bag

at an area where the dust cake is thin; they can accumulate

as a low porosity cake, thereby increasing pressure drop (For

effective gravity settling of the dust, it is important that

during cleaning, large dust agglomerates or sheets be

released). Over time, these fine particles can bleed through

the bag and cause opacity spiking (emission) after the

cleaning pulse.

Bag and Cage Installation

Bag and cage suspension from the tube sheet must make a

leak-free seal to insure clean- side / dirty-side isolation.